HTTP Status Codes Cheat Sheet 📝

1xx - Informational

• Request received, continuing process.
• Example: 100 Continue.

2xx - Success

• The request was successfully received, understood, and accepted.
• Common examples:
  • 200 OK — Standard response for successful requests (GET, PUT, PATCH, DELETE).
  • 201 Created — The request was successful and a new resource was created (POST).

3xx - Redirection

• Further action needs to be taken to complete the request.
• Example:
  • 301 Moved Permanently — Resource has been permanently moved to a new URL.

4xx - Client Error

• The request contains bad syntax or cannot be fulfilled.
• Common examples:
  • 400 Bad Request — The server could not understand the request.
  • 401 Unauthorized — Authentication is needed or failed.
  • 403 Forbidden — Server understood the request but refuses to authorize it.
  • 404 Not Found — The server cannot find the requested resource.

5xx - Server Error

• The server failed to fulfill a valid request.
• Common examples:
  • 500 Internal Server Error — The server encountered an unexpected condition.
  • 502 Bad Gateway — Server received an invalid response from an upstream server.
  • 503 Service Unavailable — The server is currently unavailable (overloaded or down for maintenance).

Notes:

• 2xx means "successful operation."
• 4xx errors are the client's fault (bad input, missing authentication, etc.).
• 5xx errors are the server's fault (server crash, bug, or overload).

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